linux-kernel - Re: [PATCH v2 04/12] drm/rockchip: vop2: clear afbc en and transform bit for cluster window at linear mode

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Message-ID: <15178289.EVyyLHbfrO@diego>
Date:   Tue, 28 Nov 2023 09:30:28 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Andy Yan <andyshrk@....com>, Andy Yan <andy.yan@...k-chips.com>
Cc:     hjc@...k-chips.com, dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        krzysztof.kozlowski+dt@...aro.org, robh+dt@...nel.org,
        devicetree@...r.kernel.org, sebastian.reichel@...labora.com,
        kever.yang@...k-chips.com, chris.obbard@...labora.com,
        s.hauer@...gutronix.de
Subject: Re: [PATCH v2 04/12] drm/rockchip: vop2: clear afbc en and transform bit for
 cluster window at linear mode

Am Dienstag, 28. November 2023, 09:03:46 CET schrieb Andy Yan:
> Hi Heiko:
> 
> On 11/27/23 23:02, Heiko Stübner wrote:
> > Am Mittwoch, 22. November 2023, 13:54:25 CET schrieb Andy Yan:
> >> From: Andy Yan <andy.yan@...k-chips.com>
> >>
> >> The enable bit and transform offset of cluster windows should be
> >> cleared when it work at linear mode, or we may have a iommu fault
> >> issue.
> >>
> >> Signed-off-by: Andy Yan <andy.yan@...k-chips.com>
> > I guess same here?
> >
> > Fixes: 604be85547ce ("drm/rockchip: Add VOP2 driver")
> 
> 
> I'm not sure if we need a Fixes tag here,  in fact this issue never happens on
> 
> rk3566/8 , because the cluster windows of rk356x only support afbc format,
> 
> they don't have a chance to switch between afbc and linear mode.
> 
> Of course, the lack support of linear mode of rk356x cluster windows is a thoughtless
> 
> of IC design, if it really support both afbc and linear format, we indeed need this fix.
> 
> The situation is the same as patch 03/12.
> 
> So I hope follow your advice, if it need a Fixes tag here.

ah ok, thanks for the explanation. Then I guess we don't need a fixes tag
when the rk3568 is not affected by this.

Same for the other patch. If you're re-sending you could add this information
to the commit message though. (existing support for rk3568 only supports
afbc cluster windows and is therefore not affected)


Thanks
Heiko